I have that MOD, but it seems to add users to the group only after new e-mail, and not the people wich have posted in the past. Only I have posted since MOD instalation, and I am the only member of the group so far.
Please, help me.
Thank you.

I have resynchronized statistics, but no change.
I do not want every user in a separate group. I want ALL USERS with at least one message in the SAME GROUP.
I need this because I want to send a mass e-mail to only 2000 users wich have posted and not all my 55.000 members as it is too much.
Are you sure there is no SQL command for doing what I want?

Create the group. Determine its group_id by hovering over the Settings option in Manage groups and looking in the browser status bar, lower left, for the value of g= at the end of the status bar line. Then Substitute that value for X in this query:

The SQL query worked but not completly. It added only 1053 users to the group and not all 2327. What could be the problem?
Here is the MODs I have installed:
Hide Sub-Sub Forums on Index
Increase Forum Rules limit
Latest Topic Title 1.1.6
Instant post redirect 1.0.4
Private Message Moderation 1.5.4
Instant login redirect
BBcode Buttons and Smilies for Quick Reply 1.1.0
Login After Register 1.0.0 [3.0.5]
Display Quick Reply by default
Show quick reply to guests
Site name in e-mai from field 1.0.1
Username and Q&A in Quick Reply
Top Posters on Index 1.0.0.a [3.0.1]
Auto Groups 1.0.2 [3.0.6]

I hope this issue is resolved soon because support for v3.0 will end soon.
Regards,
DANIEL

Because the MOD "Auto Groups" added 2327 users to a group on a test board on my computer (using XAMPP). But, for some reason, the same MOD did not add any users to my live board. I set the group the same way: users with minimum one post.